Extremely high yields can be dangerous to your portfolio. However, there is a sweet spot with proven winners yielding 6% to 8%. These companies offer that, and they increase the dividend every year.There's a common misconception that companies set the dividend yield for their stocks. Remember, a company only sets the dividend amount it pays. The market determines a stock's dividend yield, a percentage based on the dividend amount versus the share price.In other words, the market often demands higher yields ...